LIFESCI 1 Lecture Notes - Lecture 6: Anemophily, Seed Dispersal, Vascular Cambium
Document Summary
Most of what you see is sporophyte. Meiosis always produces haploid cells--in ferns that occurs in the sporangia. Sporangia are underneath the ferns and contain the spores, needs to rupture. The dominant photosynthetic structure of bryophytes is a haploid gametophyte, in a fern it is a. You can conclude that h2o independent fertilization is a synapomorphy of seed plants. Gymnosperms = cycads + ginkgo + conifers + gnetophytes. Of cycad species are endangered or threatened because of small, fragmented populations. Possibly no wild population, long history of cultivation in china. Most abundant and diverse group of gymnosperms. Three very different genera, 90 total species. Used to by very abundant and diverse. Displaced by angiosperms, many lineages now extinct. Presence of xylem vessels suggests they are angiosperms closest relatives, cue that had been disproven (vessels evolved independently) Notice: pollination are fertilization are not exactly the same thing. Female and male cones are on the same tree, different area.
